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Taxation (Details) - Schedule of reconciliations of the income tax expenses - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Reconciliations of the Income Tax Expenses [Abstract] |  |  |  |  |  |
Loss before income tax |  | $ (19,764) | $ (46,084) |  | $ (63,230) |
Income tax computed at statutory PRC income tax rate (25%) | [1] | (4,941) | (11,521) |  | (15,808) |
Differential income tax rates applicable to certain entities comprising the Group |  | 1,791 | 4,061 |  | 13,121 |
Effect of tax holiday |  | 469 | 1,786 |  | 824 |
Permanent differences |  | 2,100 | 1,826 | [2] | 451 | [2]
Change in valuation allowance |  | 1,569 | 5,405 |  | 2,735 |
Accelerated deductions on research and development expenses(iii) | [3] | (827) | (1,313) |  | (1,138) |
Income tax expenses |  | $ 161 | $ 244 |  | $ 185 |
[1] | The PRC statutory income tax rate was used because the majority of the Group’s operations are based in the PRC.
[2] | Permanent differences primarily represent non-deductible expenses.
[3] | This amount represents tax incentives relating to the research and development expenses of certain major operating subsidiaries in the PRC. This tax incentive enables those subsidiaries to claim an additional tax deduction amounting to 75% of the qualified research and development expenses incurred.

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